CFP last date
20 December 2024
Call for Paper
January Edition
IJCA solicits high quality original research papers for the upcoming January edition of the journal. The last date of research paper submission is 20 December 2024

Submit your paper
Know more
The week's pick
Responsive image
Improved Shuffled Frog Leaping Algorithm with Self-Adaptive Shuffling for Fuzzy Logic PD+G Controller Optimization in Robotic Manipulators

Duc Hoang Nguyen
Random Articles
Reseach Article

An analytical model for the 0.33 - 7.85 micron transmission spectrum of HD189733b : Effect of stellar spots

by A. Daassou, Z. Benkhaldoun, Y. Elazhari, M. Ait Moulay Larbi
journal cover thumbnail

International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Volume 107 - Number 10
Year of Publication: 2014
Authors: A. Daassou, Z. Benkhaldoun, Y. Elazhari, M. Ait Moulay Larbi
10.5120/18784-0128

A. Daassou, Z. Benkhaldoun, Y. Elazhari, M. Ait Moulay Larbi . An analytical model for the 0.33 - 7.85 micron transmission spectrum of HD189733b : Effect of stellar spots. International Journal of Computer Applications. 107, 10 ( December 2014), 1-8. DOI=10.5120/18784-0128

@article{ 10.5120/18784-0128,
author = { A. Daassou, Z. Benkhaldoun, Y. Elazhari, M. Ait Moulay Larbi },
title = { An analytical model for the 0.33 - 7.85 micron transmission spectrum of HD189733b : Effect of stellar spots },
journal = { International Journal of Computer Applications },
issue_date = { December 2014 },
volume = { 107 },
number = { 10 },
month = { December },
year = { 2014 },
issn = { 0975-8887 },
pages = { 1-8 },
numpages = {9},
url = { https://ijcaonline.org/archives/volume107/number10/18784-0128/ },
doi = { 10.5120/18784-0128 },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Journal Article
%1 2024-02-06T22:40:40.318518+05:30
%A A. Daassou
%A Z. Benkhaldoun
%A Y. Elazhari
%A M. Ait Moulay Larbi
%T An analytical model for the 0.33 - 7.85 micron transmission spectrum of HD189733b : Effect of stellar spots
%J International Journal of Computer Applications
%@ 0975-8887
%V 107
%N 10
%P 1-8
%D 2014
%I Foundation of Computer Science (FCS), NY, USA
Abstract

In recent years, the transit of HD189733b is the most observed among all known transiting exoplanets. The transmission spectrum of this planet has been measured with several instruments from Spitzer and Hubble (HST) Space Telescopes, and from several ground-based telescopes. In this paper an analytical theory is used to complete this spectrum from near-ultraviolet to infrared (0. 33 - 7. 85 m). The model suggests a new approach which take into account the quantity of light transmitted through the planetary atmosphere and the thermal emissions from the night side of the planet, to describe the transmission spectrum of HD189733b in photometric study. The availability of measures in different wavelengths has allowed us to validate our model with more efficiency. We found an agreement between our transmission spectrum model of HD189733b and data from the infrared to the UV. The model predicts a value of Rp=R? = 0:1516 at 7:3 m, which is a low value compared to all observations at different wavelengths. We interpreted this value by a fluorescence emission from sulphur dioxide (SO2). Therefore, the likely presence of these molecules in the atmosphere of HD 189733b. The second objective of this paper is to study the effect of starspots on the transmission spectrum of this hot-Jupiter. To reach this goal, we developed an analytical theory considered as an extension of the approach proposed by Berta et al. 2011 [5]. The model shows clearly that the unocculted spots would significantly increase the transit radius ratio at visible and near-ultraviolet wavelengths, while having a minimal impact at infrared wavelengths. Therefore, the wavelength dependence of the spots effect has been clearly shown by this new model. At the end of this paper, we reported the way in which this model can provide an estimation of the percentage of the unocculted spots area relative to stellar disk area for an observation of HD189733 performed in a given epoch and at a given wavelength.

References
  1. Agol, E. , Cowan, N. B. , et al. 2010, ApJ, 721, 1861
  2. Ballerini, P. , Micela, G. , et al. 2012, A &A, 539, A140
  3. Bouchy, F. , Udry, S. , et al. 2005, A&A, 444, 15-19.
  4. Bouley, S. , Baratoux, D. , et al. 2012 ,Icarus, 218, 115-124.
  5. Berta, Z. K. , Charbonneau, D. , et al. 2011, ApJ, 736, 12
  6. Carter, J. A. , Yee, J. C. , et al. 2008, ApJ, 689, 499
  7. Croll, B. , Matthews, J. M. , et al. 2007, ApJ, 671, 2129
  8. Crovisier, J. , et al. 2002, ASP Conf. Ser. 196
  9. Czesla S. , Huber K. , et al. 2009, A&A, 505, 1277
  10. D´esert, J. -M. , D. Sing , et al. 2011a, A&A, 526, A12
  11. Henry, G. W. , & Winn, J. N. 2008, AJ, 135, 68
  12. Keane, J. V. , Boonman, et al. 2001, A&A, 376, L5-L8
  13. Knutson, H. A. , Charbonneau, et al. 2007a, ApJ, 655, 564
  14. Knutson, H. A. , et al. 2007b, Nature, 447, 183
  15. Miller-Ricci, E. , Rowe, J. F. , et al. 2008, ApJ, 682, 593
  16. Pont, F. , Knutson, H. , et al. 2008, MNRAS, 385, 109
  17. Pont, F. , Sing, D. K. , et al. 2013, MNRAS, 432, 2917
  18. Seager, S. , & Mallen-Ornelas, G. , 2003, ApJ, 585, 1038
  19. Sing, D. K. , Dsert, J. -M. , et al. 2011a, A&A, 527, A73
  20. Sing, D. K. , D´esert, J. -M. , et al. 2009, A&A, 505, 891.
  21. Tinetti, G. et al. , 2007, Nature, 448, 163.
  22. Batista, V. , thesis, 2011.
  23. Winn, J. N. , et al. 2007, AJ, 133, 1828
Index Terms

Computer Science
Information Sciences

Keywords

Planetary systems - starspots - stars: individual: HD 189733 - planets: atmospheres - techniques: photometric.

Powered by PhDFocusTM